Improvement in millstones



G. MOTL'EY.

MILLsToNEs.

Patented July 11, 187e.

UNITED [STATES PATENT QFFTGE.

GEORGE MOTLEY, OF ROCHESTER, NEW YORK, ASSIGNOR .OF ONE-HALF HIS RIGHT TO JIRAH B. MOSELEY, OF .SAME PLACE.

IMPROVEMENT IN MILLSTQNMES,

Specification forming part of Lett-ers Patent No.

179,835, dated July 11, 1876; application tiled January 17,1876.

To all whom it may concern:

Be it known that I, GEORGE MoTLEv, of the city of Rochester, in the county of Monroe and State of New York, have invented a certain new and useful Improvement in Millstones; and 'I do hereby declare that the following is a full, clear, and exact description ot' the construction and operation of the same, referencebeing had to the accompanying drawings, in which- Figure l is a central vertical section of my improvement. Fig. 2 is `an inner or face view of thebed-stone. Fig. 3 is a plan of the driver for sustaining and adjusting the runner-stone. Fig.l is a detail view.

My improvement relates to stones for cracking wheat or other .grain Ineparatory to l grinding, theobject being to simply split the A represents the runner, and B the bedstone.

C is' the curb, made, preferably, of inet-al to lessen wear, and D is the framing upon which the parts rest. Each of the stones has a central cavity or depression, a, sunk deep enough to receive the grain without producing action thereon, and so as to throw the grain outward by the centrifugal motion.

Outside this cavity is a plain rim, b, in which are cut the coarse channels cc, which form the working surface for cracking the grain.

In a stone four and a half feet in diameter the channeled rim b is, preferably, nine inches wide, and the channels c c are cut at a tangent with a circle of four and a half inches radius from the center of the stone, as indicated by the' dotted lilies, Fig. 2. In differentsized stones the same, or substantially the same,

proportions may be observed. This angle of the channels is most eiective in exerting a quick action upon the grain and a rapid discharge from the stones, thereby preventingundue breaking or cracking of the wheat, which would be wasteful by disintegrating the body or walls of the wheat into small pieces that would sift out with the chits and cause loss. The wheat fed into the eye of the stones falls into the cavity a, and is thrown out by the centrifugal action. tween the channeled rims b b it receives a quick and sharp action, which is sufficient to crack or break the wheat without disintegrating it. This loosensthe chits and the seam impurities, and leaves the whole body of the wheat free to be ground into the best quality of Hour. It is obvious that to accomplish the cracking ofthe wheat without disintegration the rim b must be made narrow, so that but little action` and a rapid discharge will be given, and the angular form ofthe channels 0 c is quite as important. The runner-stone runs in that direction that will cause the inclines of the channel to pass back over each other, as indicated by the arrow, Fi'g.,4, by which means the cracked grain is carried out through the channels instead of being ground upas would be tbe case it' thestone run the other way.

d is a metallic plate fitted into the bottom ot the cavity a in the bed-stone. Its object is, iirst, to prevent undue wear ot' the stone by the forcible action of the grain therein, and, second, to lessen the friction of the grain over the cavity, which would occur if the face were exposed, thereby causing wear and friction upon the grain before reaching the rim. The smooth surface presented by the metal causes but little wear, and polishes the grain. Gr is the driver, upon which the runner stone is hung. It has three arms, fff, which tit loosely into corresponding slots of the stone. Screws g g g pass downward through the eye of the stone, near the inner periphery, and rest upon the arms of the driver. rlhe stone is adjusted or leveled by simply turning these screws. The runner is raised or lowered by means of a lever, H, which rests under the Passing be- What I claim as new is The combination, with the stones A B, provided with the cavity a and exterior rim b, of

the metallic bedplate d, set into the bottom of the cavity of the lower stone, for the purpose ot' preventing' attrition upon the grain till it reaches the louter channeled rim, as shown and described.

1n Witness whereof' l have hereunto signed` my name in lthe presence of two subscribing witnesses.

GEORGE MOTLEY. Witnesses: x

WM. S. MOORE7V i R. F. OsGooD. 

